Scaffold.



B. F. FORSYTH,

SCAFFOLD.

APPLICATION FILED DEC. 3. 19H.

1 ,2? 1 ,55Yw Patented July 9, 1918.

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I as CO..PHOTO-LITHO. WASHIN(D114 u pnnntrns ro eonie nomeonee eamena,faf-np TO FREDERICK ZIETHENJiLL OF CHICAGO, ILLINOIS.

.. A Dtwee-Annette: on'rY-rwo ONE-HUNDREDTH'S ECLFFOLD.

s ecification: remnant. awa d Jifl 9, 1918-,

Application filed December 3, 1917. Serial no. 205,105.

Toall whom it mag concern: e

Be it known that I',.;BENJAMI F. Fon- SYTH, a citizen of theUnitedStates, and a resident of the city of Chicago, county of Cook, and'State of Illinois, have invented certain new and useful Improvements inScafl'olds, of which the following is a specification. V 7 v I,

My invention relates to improvements in scaffolds, and has for itsobject the provision of an improved construction jof this characterwhich is simple and etficient i-n use and capable *of folding for easyremoval from place to place. H

The invention consists in the combinations and arrangements of partshereinafter described and claimed. or U The invention will be best'f'understood by reference to the accompanyingQdrawings forming a partof this specification, and in which: y

Figure 1 is-a partial top plan View of a scaffold embodying theinvention, with a portion of the scaffold boa-rd broken away forclearnes's,

Fig. 2, a side View of the same,

vFig. 3 a detail section taken on line 3'3 of Fig. 2,

Fig. 4, a horizontal ,sectionth'rough one of two supporting postsemployed in the construction,

Fig. 5, a vertical section corresponding with Fig. 4, 7

Fig. 6, a detail section taken on substantially line 6-6 of Fig. 4, and

Fig. 7, a detail section taken on substantially line 7-7 of Fig. 5.

The preferred form of construction, as illustrated in the drawings,comprises two upstanding supporting posts 8, in the form of iron pipesresting on pedestals or bases 9. Each of the posts 8 is provided at itsbottom with three laterally extending braces 10, pivoted at their upperends to a sleeve 11 adjustably secured in place by means of a set screw12. Each of the braces 10 is also connected by a link 13 with a sleeve14 also adjustably secured to the corresponding post 8 by means of a setscrew 12. The braces 10 are made of strips of wrought iron. or the likeand their lower outer ends are twisted, as shown, and provided. withrubber pads 15 resting upon the fioor. Each of the posts 8 is providedat one side with a longitudinal slot 16fhavinga crossslot 17 adjaeentits upper end. A supporting bracket 18 is sli'dably mounted in eachoftheslots 16 an'dprovided with a cross pin 19at its inner end. A,clamping head 20 rests upon the inner "end of each of the brackets 18,to operate within the corresponding "post 8, said bracket being providedwith an entry slot 21 extending upwardly from its lower edge, and with atooth or shoulder '22adapted to engage the under edge of thecorresponding bracket 18. flBy this arrangement it will be observed thatthe V bracket '18 may be readily inserted through slot 16 in its post,andengaged with the inner clamping head 20 by being forced into the slot21, tooth 22 and cross pin 19 preventing accidental removal andcrossslot 17 permitting of the insertion of pin 19.

A clamping head23 is slidably -mounted on enter the brackets 18 to bearagainst the outer side of the corresponding post. 8, outward movementofsaid clamping headbeing limited by a stop pin '23 as shown. A scaffoldboard supporting member 24 is pivoted at 25 to each of the brackets 18,and is proe videdat its inner end with a cam surface 26 engaging theouter side of the corresponding clamping head 23 and serving to forcesaid clamping head into clamping engagement with the post upon'downwardswinging of support 24, as will be readily understood. Each of thesupports 24 is provided with a. laterally extending stop flange 27arranged to engage the upper edge of the corresponding bracket 18, tolimit the downward swinging of the support. Each of the supports 24 isequipped with an extension 28, adjustably secured thereto by means of aset screw 29 operating through a slot 28, as shown. A stop fiange30 isprovided on the lower edge of each of the supports 24 to engage theunder side of the corresponding extension 28 to limit the downwardswinging thereof. EX- tension 28 is provided with an upwardly andinwardly extending clamping point or shoulder 31. and cam 26 with ashoulder 32, said k the appended claims.

and the braces 10 may be shoulder being arranged and adapted to engageand clamp the sides of an ordinary sca-fiold'board 33, as shown. By thisarrangement it will be observed that the scaffold supporting bracketsmay be readily adjusted to different heights 011 their posts '8,

the supports readily adjusted to engage different sizes of scaffoldboards, and the weight of and on the scaffold board serves toautomatically hold the scaffold supports clamped in adjusted positions.When it is desired to move the scaffold, thesupports 24L readily foldedagainst the posts 8 to facilitate passage through doors and the like.

Each of the posts 8 is also equipped with a plurality of foldable steps34, pivotally mounted thereon, each of said steps being concave in form,as shown, to closely fit the sides'of the corresponding post 8 and:provided with ears 34, embracing and "pivoted to the corresponding post.Each of the steps is provided with concave edges 35' to render thefooting thereon secure. By this arrangement it will be observed that thesteps may be readily extended to facilitate mounting to the scaffoldboard or folded to facilitate transportation.

While I have illustrated and described the preferred form ofconstruction for carrying my invention into eflect, this is capable ofvariation and modification without departing from the spirit of theinvention. I, therefore, do not wish to be'limited to the precisedetails of construction set forth, but desire to avail myself of suchvariations and modifications as come within the scope of Havingdescribed my invention what I claim as'new and desire to secure byLetters Patent is: p

1. A scaffold support comprising a tubular ost slotted at one side; a.bracket slidable in said slot; a clamping head on the inner end of saidbracket within said post; a clamping head slidable on said bracket andengaging the outer side of said post; a scaffold board support pivotedto said bracket;

and means operable by said board support, arranged to force said outerclamping head against said post, substantially as described.

2. A scaffold support comprisinga tubular post slotted at one side; abracket slidable in said slot; a clamping head on the inner end of saidbracket within said post; a clamping head slidable on said bracket andengaging the outerside of said post; a scaffold board support pivoted tosaid bracket; and an eccentric cam on said board support arranged toforce said outer clamping head against said post, substantially asdescribed.

3. A scaffold support comprising a tubular post slotted at one side; abracket slidable in said slot; a clamping head on the inner end of saidbracket within said post; a clamping head slidable on said bracket andengaging the outer sideof said post; a scaffold board support pivoted tosaid bracket; an eccentric cam on said board support arranged to forcesaid outer clamping head against said post; and an adjustable e ten-'sion on said board support, substantially as described. 1

4. A scaffold support comprisinga tubular post slotted at one side; abracket slidable in said slot; a clamping head on the inner end of saidbracket within said post; a clamping head slidable on said bracket andengaging the outer side of said post; a scaffold board support pivotedto said bracket, there being a stop flange on said board supportoverhanging said bracket and arranged to limit the downward swing. ofsaid board support; an adjustable extension on said board support; andan eccentric cam on the inner end of said board support arranged tocontact with and force said outer clamping head against said post,substantially as described. I 1

In testimony whereof I have signed my name to this specification in thepresence of a subscribing witness.

BENJAMIN F. FORSYTH. 7

Witness: I I

ARTHUR A. OLSON. I

Gopies'o! this patent may be obtained for five cents each, by addressingthe Commissioner 'of'Patents,

' Washington, D. 0.

